Coming from Cologne you take the A59 which becomes the B42 after passing Bonn. So you go straight on from Cologne to Unkel.
If you are travelling the A3 the easiest way is to take exit Siebengebirge/Königswinter. Take the direction Königswinter all the way down into the Rhine valley where you take the B42 direction Bad Honnef/Linz until you enter Unkel.

HSU-KG is located in the Bruchhausener Str. 11 - 15 in Unkel, only 30 meters away from highway B42.
At the Shell gas-station resp. at the restaurant "Prost Mahlzeit" you turn into Bruchhausener Str.. The second house to the right is our management building.